.TH "MONGOSTAT" "1" "March 14, 2013" "2.2.3" "mongodb-manual"
.SH NAME
mongostat \- MongoDB
.
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.SH SYNOPSIS
.sp
The \fI\%mongostat\fP utility provides a quick overview of the
status of a currently running \fBmongod\fP
or \fBmongos\fP
instance. \fI\%mongostat\fP is functionally similar to the
UNIX/Linux file system utility \fBvmstat\fP, but provides data regarding
\fBmongod\fP and \fBmongos\fP instances.
.IP "See also"
.sp
For more information about monitoring MongoDB, see
\fB/administration/monitoring\fP.
.sp
For more background on various other MongoDB status outputs see:
.INDENT 0.0
.IP \(bu 2
\fB/reference/server\-status\fP
.IP \(bu 2
\fB/reference/replica\-status\fP
.IP \(bu 2
\fB/reference/database\-statistics\fP
.IP \(bu 2
\fB/reference/collection\-statistics\fP
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.sp
For an additional utility that provides MongoDB metrics see
"\fBmongotop\fP."
.RE
.sp
\fI\%mongostat\fP connects to the \fBmongod\fP instance running
on the local host interface on TCP port \fB27017\fP; however,
\fI\%mongostat\fP can connect to any accessible remote \fBmongod\fP
instance.
.SH OPTIONS
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.TP
.B mongostat
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.B \-\-help
Returns a basic help and usage text.
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.B \-\-verbose, \-v
Increases the amount of internal reporting returned on the command
line. Increase the verbosity with the \fB\-v\fP form by including
the option multiple times, (e.g. \fB\-vvvvv\fP.)
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.B \-\-version
Returns the version of the \fI\%mongostat\fP utility.
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.B \-\-host <hostname><:port>
Specifies a resolvable hostname for the \fBmongod\fP from which you
want to export data. By default \fI\%mongostat\fP attempts to connect
to a MongoDB instance running on the localhost port number \fB27017\fP.
.sp
Optionally, specify a port number to connect a MongoDB instance
running on a port other than \fB27017\fP.
.sp
To connect to a replica set, you can specify the replica set seed
name, and a seed list of set members, in the following format:
.sp
.nf
.ft C
<replica_set_name>/<hostname1><:port>,<hostname2:<port>,...
.ft P
.fi
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.B \-\-port <port>
Specifies the port number, if the MongoDB instance is not running on
the standard port. (i.e. \fB27017\fP) You may also specify a port
number using the \fI\%mongostat --host\fP command.
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.B \-\-ipv6
Enables IPv6 support that allows \fI\%mongostat\fP to connect
to the MongoDB instance using an IPv6 network. All MongoDB programs
and processes, including \fI\%mongostat\fP, disable IPv6
support by default.
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.B \-\-ssl
New in version 2.4: MongoDB added support for SSL connections to \fBmongod\fP
instances in mongostat.
.IP Note
SSL support in mongostat is not compiled into the default
distribution of MongoDB. See \fB/administration/ssl\fP for more
information on SSL and MongoDB.
.sp
Additionally, mongostat does not support connections to
\fBmongod\fP instances that require client certificate
validation.
.RE
.sp
Allows \fI\%mongostat\fP to connect to \fBmongod\fP
instance over an SSL connection.
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.B \-\-username <username>, \-u <username>
Specifies a username to authenticate to the MongoDB instance, if your
database requires authentication. Use in conjunction with the
\fI\%mongostat --password\fP option to supply a password.
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.B \-\-password <password>, \-p <password>
Specifies a password to authenticate to the MongoDB instance. Use
in conjunction with the \fI\%mongostat --username\fP option to
supply a username.
.sp
If you specify a \fI\%--username\fP
without the \fI\%--password\fP option, \fI\%mongostat\fP will
prompt for a password interactively.
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.B \-\-authenticationDatabase <dbname>
New in version 2.4.
.sp
Specifies the database that holds the user\(aqs (e.g
\fI\%--username\fP) credentials.
.sp
By default, \fI\%mongostat\fP assumes that the database specified to the
\fI\-\-db\fP argument holds the user\(aqs credentials, unless you
specify \fI\%--authenticationDatabase\fP.
.sp
See \fBuserSource\fP,
\fB/reference/privilege\-documents\fP and
\fB/reference/user\-privileges\fP for more information about
delegated authentication in MongoDB.
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.B \-\-authenticationMechanism <name>
New in version 2.4.
.sp
Specifies the authentication mechanism. By default, the
authentication mechanism is \fBMONGODB\-CR\fP, which is the MongoDB
challenge/response authentication mechanism. In the MongoDB Subscriber Edition,
\fI\%mongostat\fP also includes support for \fBGSSAPI\fP to handle
Kerberos authentication.
.sp
See \fB/tutorial/control\-access\-to\-mongodb\-with\-kerberos\-authentication\fP
for more information about Kerberos authentication.
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.B \-\-noheaders
Disables the output of column or field names.
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.B \-\-rowcount <number>, \-n <number>
Controls the number of rows to output. Use in conjunction with
the \fBsleeptime\fP argument to control the duration of a
\fI\%mongostat\fP operation.
.sp
Unless \fI\%--rowcount\fP is specified, \fI\%mongostat\fP
will return an infinite number
of rows (e.g. value of \fB0\fP.)
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.B \-\-http
Configures \fI\%mongostat\fP to collect data using the HTTP interface
rather than a raw database connection.
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.B \-\-discover
With this option \fI\%mongostat\fP discovers and reports on
statistics from all members of a \fIreplica set\fP or
\fIsharded cluster\fP. When connected to any member of a replica
set, \fI\%--discover\fP all non\-\fIhidden members\fP of the replica set. When connected to a \fBmongos\fP,
\fI\%mongostat\fP will return data from all \fIshards\fP in the cluster. If a replica set provides a shard in the
sharded cluster, \fI\%mongostat\fP will report on non\-hidden
members of that replica set.
.sp
The \fI\%mongostat --host\fP option is not required but
potentially useful in this case.
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.B \-\-all
Configures \fI\%mongostat\fP to return all optional \fI\%fields\fP.
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.B <sleeptime>
The final argument is the length of time, in seconds, that
\fI\%mongostat\fP waits in between calls. By default \fI\%mongostat\fP
returns one call every second.
.sp
\fI\%mongostat\fP returns values that reflect the operations
over a 1 second period. For values of \fB<sleeptime>\fP greater
than 1, \fI\%mongostat\fP averages data to reflect average
operations per second.
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.SH FIELDS
.sp
\fI\%mongostat\fP returns values that reflect the operations over a
1 second period. When \fBmongostat <sleeptime>\fP has a value
greater than 1, \fI\%mongostat\fP averages the statistics to reflect
average operations per second.
.sp
\fI\%mongostat\fP outputs the following fields:
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.B inserts
The number of objects inserted into the database per second. If
followed by an asterisk (e.g. \fB*\fP), the datum refers to a
replicated operation.
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.B query
The number of query operations per second.
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.B update
The number of update operations per second.
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.B delete
The number of delete operations per second.
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.B getmore
The number of get more (i.e. cursor batch) operations per second.
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.B command
The number of commands per second. On \fIslave\fP and
\fIsecondary\fP systems, \fI\%mongostat\fP presents two values
separated by a pipe character (e.g. \fB|\fP), in the form of
\fBlocal|replicated\fP commands.
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.B flushes
The number of \fIfsync\fP operations per second.
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.B mapped
The total amount of data mapped in megabytes. This is the total
data size at the time of the last \fI\%mongostat\fP call.
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.B size
The amount of (virtual) memory in megabytes used by the process at
the time of the last \fI\%mongostat\fP call.
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.B res
The amount of (resident) memory in megabytes used by the process at
the time of the last \fI\%mongostat\fP call.
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.B faults
Changed in version 2.1.
.sp
The number of page faults per second.
.sp
Before version 2.1 this value was only provided for MongoDB
instances running on Linux hosts.
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.B locked
The percent of time in a global write lock.
.sp
Changed in version 2.2: The \fBlocked db\fP field replaces the \fBlocked %\fP field to
more appropriate data regarding the database specific locks in
version 2.2.
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.B locked db
New in version 2.2.
.sp
The percent of time in the per\-database context\-specific
lock. \fI\%mongostat\fP will report the database that has spent
the most time since the last \fI\%mongostat\fP call with a write
lock.
.sp
This value represents the amount of time that the listed database
spent in a locked state \fIcombined\fP with the time that the
\fBmongod\fP spent in the global lock. Because of this, and
the sampling method, you may see some values greater than 100%.
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.B idx miss
The percent of index access attempts that required a page fault
to load a btree node. This is a sampled value.
.UNINDENT
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.B qr
The length of the queue of clients waiting to read data from the
MongoDB instance.
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.B qw
The length of the queue of clients waiting to write data from the
MongoDB instance.
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.B ar
The number of active clients performing read operations.
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.B aw
The number of active clients performing write operations.
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.B netIn
The amount of network traffic, in \fIbytes\fP, received by the MongoDB instance.
.sp
This includes traffic from \fI\%mongostat\fP itself.
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.B netOut
The amount of network traffic, in \fIbytes\fP, sent by the MongoDB instance.
.sp
This includes traffic from \fI\%mongostat\fP itself.
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.B conn
The total number of open connections.
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.B set
The name, if applicable, of the replica set.
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.B repl
The replication status of the node.
.TS
center;
|l|l|.
_
T{
\fBValue\fP
T}	T{
\fBReplication Type\fP
T}
_
T{
M
T}	T{
\fImaster\fP
T}
_
T{
SEC
T}	T{
\fIsecondary\fP
T}
_
T{
REC
T}	T{
recovering
T}
_
T{
UNK
T}	T{
unknown
T}
_
T{
SLV
T}	T{
\fIslave\fP
T}
_
.TE
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.SH USAGE
.sp
In the first example, \fI\%mongostat\fP will return data every
second for 20 seconds. \fI\%mongostat\fP collects data from the
\fBmongod\fP instance running on the localhost interface on
port 27017. All of the following invocations produce identical
behavior:
.sp
.nf
.ft C
mongostat \-\-rowcount 20 1
mongostat \-\-rowcount 20
mongostat \-n 20 1
mongostat \-n 20
.ft P
.fi
.sp
In the next example, \fI\%mongostat\fP returns data every 5 minutes
(or 300 seconds) for as long as the program runs. \fI\%mongostat\fP
collects data from the \fBmongod\fP instance running on the
localhost interface on port \fB27017\fP. Both of the following
invocations produce identical behavior.
.sp
.nf
.ft C
mongostat \-\-rowcount 0 300
mongostat \-n 0 300
mongostat 300
.ft P
.fi
.sp
In the following example, \fI\%mongostat\fP returns data every 5
minutes for an hour (12 times.) \fI\%mongostat\fP collects data
from the \fBmongod\fP instance running on the localhost interface
on port 27017. Both of the following invocations produce identical
behavior.
.sp
.nf
.ft C
mongostat \-\-rowcount 12 300
mongostat \-n 12 300
.ft P
.fi
.sp
In many cases, using the \fI\%--discover\fP
will help provide a more complete snapshot of the state of an entire
group of machines. If a \fBmongos\fP process connected to a
\fIsharded cluster\fP is running on port \fB27017\fP of the local
machine, you can use the following form to return statistics from all
members of the cluster:
.sp
.nf
.ft C
mongostat \-\-discover
.ft P
.fi
.SH AUTHOR
MongoDB Documentation Project
.SH COPYRIGHT
2011-2013, 10gen, Inc.
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